O5
G91G28Z0
T2M6
G54G17G40G49G80G90
M3S2000
G43G1H2Z100F2000
X-0Y0
Z3
Z0
#1=0
N10 #1=#1+0.5
X-10
G1X10 Z-#1 F1500
G3I-10
G1X-19.5
Y19.5
X19.5
Y-19.5
X-19.5
Y0
X0Y0
IF[#1LT5]GOTO10
G1G49Z100F2000
M5
M99